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Aug 01,  · The total hardness is the sum of magnesium and calcium concentrations, or calcium carbonate, in milligrams per liter (mg/L). Many electric water softeners will use the hardness number set in your water softener to calculate how frequently the water softener will have to regenerate. the water softener must work to remove the hard water.

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Mar 20,  · Note: The operating capacity of a softening resin will differ depending upon the ratio of calcium hardness to magnesium hardness because the selectivity ratio of Ca versus Na is higher than that of Mg versus Na. Total capacity is actually determined on a dry-resin basis as meq/dry gm and converted to wet values (meq/mL) based on moisture.